Refractoriness higher than 1580 ° C, inorganic non-metallic materials. Refractoriness refractory cone specimen in the case of no load, resistance to high temperatures without softening the Celsius temperature melt down. Refractories and high temperature technology accompanied by roughly originated in the middle of the Bronze Age. China during the Eastern Han Dynasty kiln wood burning porcelain and sagger clay refractories. The beginning of the 20th century, refractory to high-purity, high density and ultra-high-temperature products direction development, at the same time completely without firing small energy consumption unshaped refractories and refractory fiber. Modern, with the atomic energy technology, space technology, the development of new energy technologies, with a high temperature, corrosion resistance, thermal shock resistant to erosion and other excellent performance of refractory application.
Refractory wide variety, usually divided into ordinary refractory (1580 to 1770 ° C), refractoriness level of advanced refractories (1770 ~ 2000 ℃) and super refractories divided into acidic refractories (2000 ° C or more); chemical properties , of neutral refractories and basic refractories. In addition, there refractories for special occasions.
Acid refractory silicon oxide as the main ingredient used silica brick and clay bricks. Silica brick siliceous products containing more than 93% of the silicon oxide, silica, waste silica brick in the raw materials used, the acid resistance of slag erosion, high temperature RUL the the repeated calcination volume contraction, or even a slight expansion; but vulnerable to the erosion of basic slag thermal vibration of poor. Silica brick for coke oven, glass furnace, acidic steelmaking furnace thermal equipment. Clay brick refractory clay as the main raw material, containing 30% to 46% alumina, is a weak acid refractories, good thermal shock resistance, corrosion resistance in acidic slag, a wide range of applications.
Neutral refractory alumina, chromium or carbon as a main component. Corundum products containing more than 95% of the alumina is a wider use of quality refractories. Chrome brick containing chromium oxide as a major component is good, but the corrosion resistance of the steel slag in the thermal shock resistance is poor, high-temperature load deformation temperature is lower. Carbonaceous refractory carbon bricks, graphite products, and a silicon nitride article, its very low coefficient of thermal expansion, high thermal conductivity, good heat vibration performance, high-temperature strength, the erosion of the anti-acid and salt, free from metal and the melt slag wetting, light weight. Widely used as a high-temperature furnace lining material is also used as the petroleum, chemical autoclave lined.
Basic refractories, magnesium oxide, calcium oxide as a main component, is commonly used magnesia brick. Containing more than 80% to 85% magnesium oxide, magnesia brick, of alkaline slag and iron slag has good resistance, high refractoriness than clay bricks and silica bricks. Mainly used in open-hearth furnace, basic oxygen furnace, electric furnace, non-ferrous metal smelting equipment, as well as some high-temperature equipment.
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